九年级Lesson26Keep the candle burning.ppt

,Welcome to our class,Do you like doing science experiments？Why?Have you done a science experiment?,They are doing experiments。,Lesson 26 Keep the Candle Burning,Burning needs_.,Experiment name:How much oxygen is there in the air?,oxygen,a candle,a candle holder,a big glass jar,a shallow dish,a lighter,matches,some water,()Put the candle holder on the dish.()Examine the water in the jar.()Fill the dish half full with water.()Let the candle burn for two or three minutes.()Put the candle in the candle holder.()Light the candle.()Carefully put the jar over the candle until the top of the jar rests on the dish.,Listen carefully and put the sentencesin the correct order.,2,7,3,5,1,4,6,burning,match,lighter,Let,until,As,uses,used,up,one,fifth,is,made,up,of,rises,Watch Say and Fill,First,_the candle _the candle holder.Second,_the candle holder _the dish.Third,_the dish _ water.Fourth,_the candle.Fifth,_the candle _for two or three minutes.,How do we do the experiment,put,put,on,in,fill,half full with,light,let,burn,Imagine and predict,If I put the jar over the candle until the top of the jar rests on the dish,what will happen?Im not sure Im sure will+v I think Maybe,What observation can you make?,The candle stops burning.,The water rises up.,Do,Observe and answer,Sixth,carefully put the jar over the candle until the top of the jar rests on the dish.Finally,examine the water in the jar.What can you see?,Discussing,Why did the candle stop burning?Why did the water rise?How far did the water rise?Why?What does this experiment show about air?,Because it has_ the oxygen in the air and there is_ oxygen in the jar.,Because the force outside the jar is _ than the force inside the jar.,Because there is about _oxygen in the air,so the water rises and fills about _of the jar.,It proved that there is _ oxygen in the air.,used up,no,stronger,one-fifth,one-fifth,one-fifth,Group Work,Task 1:Do and speak English Work in groups,one is to do the experiment by himself.others describe the steps and the conclusion of the experiment in English（以小组形式做实验，并用英语叙述实验步骤和结论。）Task 2：Finish the experiment report!While doing the experiment,one is to write the experiment report!Chose one student to check another group.（再选一名学生写实验报告单，一名学生做监督员。如果说汉语为失败。）,Name:Which Group:Date:,How much oxygen is there in the air?,a candle，a candle holdera big glass jar，a shallow dish some water,matches or lighter,1.Put the candle in the candle holder.2.Put the candle holder on the dish.3.Fill the dish half full with water.4.light the candle.5.let the candle burn for two or three minutes.6.carefully put the jar over the candle until the top of the jar rests on the dish.7.Examine the water in the jar.,The candle stops burning.The water rises up.,There is one fifth oxygen in the air.,Try Your Best,名称：带电的报纸材料：一支铅笔 一张报纸步骤:1.把报纸铺在墙上 2.用铅笔的侧面在报纸上迅速摩擦 3.把手慢慢移开（猜测会发生什么？）4.报纸粘在了墙上 5.慢慢地把报纸从墙上接下来,仔细听会有噼啪的静电声结论:铅笔和报纸摩擦产生静电,把报纸粘在墙上。（提示：静电 static electricity;摩擦 rub 产生 produce)（first second third then finally),Homework,1.Do and describe this experiment to your family.2.Try to write another experiment that you have learned in English.,Goodbye!,Thank you for listening!,